In the Wikipedia article on Cloakroom there is the following paragraph:
Attended cloakrooms, or coat checks, are staffed rooms where coats and bags can be stored securely. Typically, a ticket or receipt is given to the customer, with a corresponding ticket attached to the garment or item.
I am trying to figure out why it uses "the customer" and "the garment or item", instead of "a customer" and "a garment or item". These nouns were not introduced before so we don't actually know them to use the definite article.
Could anyone explain that, please?